Abstract: H14.00012 : Stick-Slip and the Transition to Sliding in a 2D Granular Medium and a Fixed Particle Lattice

Authors:

Robert Behringer
(Duke University)

Jackie Krim
(NC State University)

We report an experimental study of stick-slip to steady sliding
for a solid object pulled via a spring across 2D granular
substrates of photoelastic disks that are either fixed in a
solid lattice or unconstrained, i.e. a disordered granular bed.
We observe a progression of friction regimes with increasing
sliding speed: single, mixed, and double slip-stick regimes,
steady sliding, and inertial oscillations. For the granular
bed, we characterize frictional behavior for the low speed
stick-slip regime, including spring and elastic energy
dependencies. For the granular solid, we explore friction
with/without externally applied vibrations, and compare to
sliding on a granular bed. We find that external vibration
reduces transition values for both the single to double slip
transition and the stick-slip to steady sliding transition.
Moreover, we observe that the effect of packing disorder on
granular friction appears similar to the effect of vibration
induced disorder, a result that to our knowledge has not been
reported previously in the experimental literature.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.H14.12